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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 40 Abstracts search results
Document:
SP82-39
Date:
September 1, 1984
Author(s):
N.G. Zoldners and J.A. Soles
Publication:
Symposium Papers
Volume:
82
Abstract:
Non-destructive concrete testing methods provide construction engineers and concrete technologists with useful tools for quality control of concrete and for evaluating the strength and durability of existing structures. This annotated bibliography, chronologically arranged, compiles literature published from 1975 to 1983 on innovations and modifications of non-destructive methods used for the testing of concrete. Attention was focused on the new methods used for monitoring concrete deterioration, crack development and corrosion of reinforcement. The journals, symposia and books selected for review have international stature, and contain state-of-art experimental works from diverse laboratories. Authors' abstracts or their translations are included when possible, to assist the. Concrete engineer in determining the applicability of a method to provide needed data. The study was made possible with a Canadian government contract awarded to the senior author.
DOI:
10.14359/6584
SP82-38
Makoto Kagaya, Hiroshi Tokuda, Makoto Kawakami, and Masami Shoya
The variation in the mechanical properties in the vertical direction can be assessed by the ratio of the difference between the measured value in top layer and that in the bottom layer over standard value obtained from cylinder concrete. The variation in internal composition can be estimated from that of unit coarse aggregate content. Good relationship existed between the degree of variation of unit coarse aggregate content in vertical direction and the ratio of unit aggregate content in the top layer to the specified value. Good relationship between the variation in the mechanical properties in vertical direction and that of internal composition represented by a ratio relative to the coarse aggregate content was also recognized. The variation in the degree of mechanical properties in the vertical direction could be assessed with good accuracy by measuring only the unit coarse aggregate content in the top layer. The simple and quick procedure developed in this work can be used to study the effect of segregation due to vibration-compaction on the mechanical properties in concrete structures and also to control the quality of concrete placed.
10.14359/6583
SP82-37
M.P. Rebic
During the compressive loading of 20 cm and 10 cm concrete cubes, acoustic emission (AE) and the ultrasonic pulse transit time were measured. The critical load ( 6 ) at which the internal structure of the concrete the AE- 6 and 6 and 6 the factor F =6/6. i d e a l l y ductile completely brittle begins to be damaged is determined from transit-time/ 6 diagrams. The ratio between rupture load, is defined as the crackability This factor increases from zero (f o r materials) towards a value o f 1 .0 (f o r materials). From the tests described it follows that the factor has practically the same value whether from A E or ultrasonic measurements. Itit also is determined follows that the statistical distribution of the factor F is wider than the distribution of the rupture loads, which means that the start of the irreversible changes lies in a wider range of loading than the rupture load.
10.14359/6582
SP82-36
Kiyoshi Okada, Kazuo Kobayashi and Toyoaki Miyagawa
chlorides; corrosion; maintenance; measurement; nondestructive tests; offshore structures; polarization; reinforcing steels; repair.
10.14359/6581
SP82-35
H. Tamura and M. Yoshida
This paper presents a new non-destructive detecting method of corrosion of reinforcing steel in concrete. The state of corrosion of steel can be electrochemically estimated by using not only natural potential, but also polarization and electrolyte resistance. These three kinds of electrochemical values can be measured with a polarization resistance meter and a two-electrode probe set on the surface of concrete above any measuring point of steel. These values obtained from the surface of concrete are only apparent, being composed of the values in both anodic and cathodic sites. The authors therefore analysed the relationship between the measured apparent values and real values in an equivalent electric circuit reflecting the corrosion phenomenon in concrete, Furthermore, the relationship among the various kinds of electro-chemical characteristics was evaluated by a numerical study. In-situ application of the new non-destructive method is also presented.
10.14359/6580
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